The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 09, 2014
Filed:
Oct. 27, 2010
Ingu Hwang, Seoul, KR;
Sungwook Shin, Seoul, KR;
Jongchan Kim, Seoul, KR;
Seungkyun OH, Seoul, KR;
Jinseok Im, Seoul, KR;
Jungeun Lim, Seoul, KR;
Ingu Hwang, Seoul, KR;
Sungwook Shin, Seoul, KR;
Jongchan Kim, Seoul, KR;
Seungkyun Oh, Seoul, KR;
Jinseok Im, Seoul, KR;
Jungeun Lim, Seoul, KR;
LG Electronics Inc., Seoul, KR;
Abstract
Provided are a device and method for detecting watermarks in content carrying watermarks. One method for watermark detection according to the present invention comprises the steps of: extracting the label of a frequency component of the content; generating a bit sequence by making bit values correspond on the basis of changes in the label being extracted; checking correlation while shifting the phase of the band-spreading code (pn sequence) with respect to the generated bit sequence; and checking the amount of phase shift in the band-spreading code at times when the correlation checked in this way falls into the category of autocorrelation, and then determining a bit group having a value corresponding to the amount of phase shift checked in this manner. The bit group determined in this way constitutes part of watermark data.